scholarly journals Microwave photonic filters using optical to microwave frequency bandwidth translation with Kerr soliton crystal micro-combs

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
High Resolution ◽  
High Performance ◽  
Ring Resonator ◽  
Transfer Functions ◽  
Microwave Frequency ◽  
Frequency Bandwidth ◽  
Rf Filters ◽  
High Q ◽  
Microwave Photonic Filters ◽  
Bandwidth Scaling

Abstract We demonstrate high-resolution photonic RF filters using an RF bandwidth scaling approach based on integrated Kerr optical micro-combs. By employing both an active nonlinear micro-ring resonator (MRR) as a high-quality micro-comb source and a passive high-Q MRR to slice the shaped comb, a large RF instantaneous bandwidth of 4.64 GHz and a high resolution of 117 MHz are achieved, together with a broad RF operation band covering 3.28 to 19.4 GHz (L to Ku bands) using thermal tuning. We achieve programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes. Our approach is an attractive solution for high performance RF spectral shaping with high performance and flexibility.

scholarly journals Photonic RF channelizer based on 49GHz soliton crystal microcombs

2020 ◽  
Author(s):  
David Moss ◽  
Roberto Morandotti ◽  
Arnan Mitchell ◽  
xingyuan xu ◽  
mengxi tan ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Ring Resonator ◽  
Rf Receivers ◽  
High Q ◽  
Monolithically Integrated ◽  
Broadband Radio ◽  
Significant Step ◽  
Multi Wavelength ◽  
Reduced Complexity

We report a broadband radio frequency (RF) channelizer with up to 92 channels using a coherent microcomb source. A soliton crystal microcomb, generated by a 49 GHz micro-ring resonator (MRR), is used as a multi-wavelength source. Due to its ultra-low comb spacing, up to 92 wavelengths are available in the C band, yielding a broad operation bandwidth. Another high-Q MRR is employed as a passive optical periodic filter to slice the RF spectrum with a high resolution of 121.4 MHz. We experimentally achieve an instantaneous RF operation bandwidth of 8.08 GHz and verify RF channelization up to 17.55 GHz via thermal tuning. Our approach is a significant step towards the monolithically integrated photonic RF receivers with reduced complexity, size, and unprecedented performance, which is important for wide RF applications ranging from broadband analog signal processing to digital-compatible signal detection.

scholarly journals High performance RF filters via bandwidth scaling with Kerr micro-combs

APL Photonics ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 026102 ◽  
Author(s):  
Xingyuan Xu ◽  
Mengxi Tan ◽  
Jiayang Wu ◽  
Thach G. Nguyen ◽  
Sai T. Chu ◽  
...  
Keyword(s):  
High Performance ◽  
Rf Filters ◽  
Bandwidth Scaling

scholarly journals Photonic RF and microwave channelizer based on a Kerr soliton crystal micro-comb

2020 ◽  
Author(s):  
David Moss
Keyword(s):  
Signal Processing ◽  
Signal Detection ◽  
High Performance ◽  
Ring Resonator ◽  
Low Complexity ◽  
Analog Signal ◽  
Major Advance ◽  
Fully Integrated ◽  
High Q ◽  
Temperature Tuning

We report a 92 channel RF channelizer based on a 48.9 GHz integrated micro-comb that operates via soliton crystals, together with a passive high-Q ring resonator that acts as a periodic filter with an optical 3dB bandwidth of 121.4 MHz. We obtain an instant RF bandwidth of 8.08 GHz and 17.55 GHz achieved through temperature tuning. These results represent a major advance to achieving fully integrated photonic RF spectrum channelizers with reduced low complexity, size, and high performance for digital-compatible signal detection and broadband analog signal processing.

scholarly journals Photonic RF channelizer based on 49GHz soliton crystal microcombs

2020 ◽  
Author(s):  
David Moss ◽  
Roberto Morandotti ◽  
Arnan Mitchell ◽  
xingyuan xu ◽  
mengxi tan ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Ring Resonator ◽  
Rf Receivers ◽  
High Q ◽  
Monolithically Integrated ◽  
Broadband Radio ◽  
Significant Step ◽  
Multi Wavelength ◽  
Reduced Complexity

We report a broadband radio frequency (RF) channelizer with up to 92 channels using a coherent microcomb source. A soliton crystal microcomb, generated by a 49 GHz micro-ring resonator (MRR), is used as a multi-wavelength source. Due to its ultra-low comb spacing, up to 92 wavelengths are available in the C band, yielding a broad operation bandwidth. Another high-Q MRR is employed as a passive optical periodic filter to slice the RF spectrum with a high resolution of 121.4 MHz. We experimentally achieve an instantaneous RF operation bandwidth of 8.08 GHz and verify RF channelization up to 17.55 GHz via thermal tuning. Our approach is a significant step towards the monolithically integrated photonic RF receivers with reduced complexity, size, and unprecedented performance, which is important for wide RF applications ranging from broadband analog signal processing to digital-compatible signal detection.

Photonic RF and microwave channelizer based on a Kerr soliton crystal micro-comb

2020 ◽  
Author(s):  
David Moss
Keyword(s):  
Signal Processing ◽  
Signal Detection ◽  
High Performance ◽  
Ring Resonator ◽  
Low Complexity ◽  
Analog Signal ◽  
Major Advance ◽  
Fully Integrated ◽  
High Q ◽  
Temperature Tuning

We report a 92 channel RF channelizer based on a 48.9 GHz integrated micro-comb that operates via soliton crystals, together with a passive high-Q ring resonator that acts as a periodic filter with an optical 3dB bandwidth of 121.4 MHz. We obtain an instant RF bandwidth of 8.08 GHz and 17.55 GHz achieved through temperature tuning. These results represent a major advance to achieving fully integrated photonic RF spectrum channelizers with reduced low complexity, size, and high performance for digital-compatible signal detection and broadband analog signal processing.

scholarly journals Broadband Photonic RF Channelizer Based on a C-Band Kerr Soliton Crystal Micro-Comb

2020 ◽  
Author(s):  
Mengxi Tan ◽  
Xingyuan Xu ◽  
Jiayang Wu ◽  
Andreas Boes ◽  
Bill Corcoran ◽  
...  
Keyword(s):  
Signal Processing ◽  
Signal Detection ◽  
High Performance ◽  
Ring Resonator ◽  
Low Complexity ◽  
Analog Signal ◽  
Major Advance ◽  
Fully Integrated ◽  
High Q ◽  
Temperature Tuning

We report a 92 channel RF channelizer based on a 48.9 GHz integrated micro-comb that operates via soliton crystals, together with a passive high-Q ring resonator that acts as a periodic filter with an optical 3dB bandwidth of 121.4 MHz. We obtain an instant RF bandwidth of 8.08 GHz and 17.55 GHz achieved through temperature tuning. These results represent a major advance to achieving fully integrated photonic RF spectrum channelizers with reduced low complexity, size, and high performance for digital-compatible signal detection and broadband analog signal processing.

scholarly journals Photonic RF channelizer based on 49GHz soliton crystal microcombs

2020 ◽  
Author(s):  
David Moss ◽  
Roberto Morandotti ◽  
Arnan Mitchell ◽  
xingyuan xu ◽  
mengxi tan ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Ring Resonator ◽  
Rf Receivers ◽  
High Q ◽  
Monolithically Integrated ◽  
Broadband Radio ◽  
Significant Step ◽  
Multi Wavelength ◽  
Reduced Complexity

We report a broadband radio frequency (RF) channelizer with up to 92 channels using a coherent microcomb source. A soliton crystal microcomb, generated by a 49 GHz micro-ring resonator (MRR), is used as a multi-wavelength source. Due to its ultra-low comb spacing, up to 92 wavelengths are available in the C band, yielding a broad operation bandwidth. Another high-Q MRR is employed as a passive optical periodic filter to slice the RF spectrum with a high resolution of 121.4 MHz. We experimentally achieve an instantaneous RF operation bandwidth of 8.08 GHz and verify RF channelization up to 17.55 GHz via thermal tuning. Our approach is a significant step towards the monolithically integrated photonic RF receivers with reduced complexity, size, and unprecedented performance, which is important for wide RF applications ranging from broadband analog signal processing to digital-compatible signal detection.

scholarly journals IEEE Microwave Photonics Conference 2020 Tu1.2 channelizer OSF

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Signal Processing ◽  
Signal Detection ◽  
High Performance ◽  
Ring Resonator ◽  
Low Complexity ◽  
Major Advance ◽  
Fully Integrated ◽  
High Q ◽  
Temperature Tuning ◽  
Ieee Microwave

We report a 92 channel RF channelizer based on a 48.9 GHz integrated micro-comb that operates via soliton crystals, together with a passive high-Q ring resonator that acts as a periodic filter with an optical 3dB bandwidth of 121.4 MHz. We obtain an instant RF bandwidth of 8.08 GHz and 17.55 GHz achieved through temperature tuning. These results represent a major advance to achieving fully integrated photonic RF spectrum channelizers with reduced low complexity, size, and high performance for digital-compatible signal detection and broadband analog signal processing.

High-resolution scanning electron microscopy of thin-film magnetic media of magnetic recording disk

1992 ◽  
Vol 50 (2) ◽  
pp. 1334-1335
Author(s):  
K. Ogura ◽  
H. Nishioka ◽  
N. Ikeo ◽  
T. Kanazawa ◽  
J. Teshima
Keyword(s):  
Thin Film ◽  
Fine Structure ◽  
High Resolution ◽  
Magnetic Recording ◽  
High Performance ◽  
Magnetic Hysteresis ◽  
Grain Structure ◽  
Magnetic Media ◽  
Cross Sectional ◽  
Resolution Observation

Structural appraisal of thin film magnetic media is very important because their magnetic characters such as magnetic hysteresis and recording behaviors are drastically altered by the grain structure of the film. However, in general, the surface of thin film magnetic media of magnetic recording disk which is process completed is protected by several-nm thick sputtered carbon. Therefore, high-resolution observation of a cross-sectional plane of a disk is strongly required to see the fine structure of the thin film magnetic media. Additionally, observation of the top protection film is also very important in this field.Recently, several different process-completed magnetic disks were examined with a UHR-SEM, the JEOL JSM 890, which consisted of a field emission gun and a high-performance immerse lens. The disks were cut into approximately 10-mm squares, the bottom of these pieces were carved into more than half of the total thickness of the disks, and they were bent. There were many cracks on the bent disks. When these disks were observed with the UHR-SEM, it was very difficult to observe the fine structure of thin film magnetic media which appeared on the cracks, because of a very heavy contamination on the observing area.

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